ViewSonic is best known for computer monitors but have branched out into the world of video projectors, HDTV sets and other more home theater oriented products. They have very wide distribution including computer retailers, warehouse stores like Costco and beyond. In recent years ViewSonic has pulled back a bit from the home theater market. At one point ViewSonic was making wireless remote devices for the likes of Crestron however those were fraught with problems and installer complaints. ViewSonic projectors today are less marketed to the home theater market and more towards the office/educational/commercial market.
Compare ViewSonic to a company like Epson.